42458781 has 8 divisors (see below), whose sum is σ = 57409344. Its totient is φ = 27907040.

The previous prime is 42458723. The next prime is 42458783. The reversal of 42458781 is 18785424.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42458781 - 2¹⁷ = 42327709 is a prime.

It is a super-2 number, since 2×42458781² = 3605496168011922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42458783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99456 + ... + 99881.

It is an arithmetic number, because the mean of its divisors is an integer number (7176168).

Almost surely, 2^42458781 is an apocalyptic number.

It is an amenable number.

42458781 is a deficient number, since it is larger than the sum of its proper divisors (14950563).

42458781 is a wasteful number, since it uses less digits than its factorization.

42458781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199411.

The product of its digits is 71680, while the sum is 39.

The square root of 42458781 is about 6516.0402853267. The cubic root of 42458781 is about 348.8637465072.

The spelling of 42458781 in words is "forty-two million, four hundred fifty-eight thousand, seven hundred eighty-one".